U.S. Army Sgt. Johnathan Oberholz, an infantryman with Charlie Troop, 2nd Squadron, 106th Cavalry Regiment, crosses a one-rope bridge during an infantry subject matter expert exchange in Constanza, Dominican Republic, on June 8, 2011. The exchange involved trainers and experts from the Dominican Republic and the United States working together to share infantry tactics, techniques and ideas in a jungle environment.